Question

7. If y varies directly w³, and y = 25 when w = 5, find the value of y when w = 2.

Answer 1

Answer:

8/5

Step-by-step explanation:

If y varies directly w³, and y = 25 when w = 5, find the value of y when w = 2.

Given:

• y=kw³, where k is coefficient

When w=5

• y= k*5³= 125k  and y=25

• 125k=25

• k=25/125= 1/5

As the value of k is known, we have new equation:

• y= w³ / 5

For w=2 we have

• y= 2³/5= 8/5

Answer: 8/5